ALLEN-BRADLEY BULLETIN 1336 MACHINE STOP

ALLEN-BRADLEY
ALLEN-BRADLEY
BULLETIN 1336
MACHINE STOP-ELECTRICAL
APPLICATION NOTE #5
January 2, 1997
PURPOSE
The purpose of this document is to provide guidelines for
wiring and control schemes for the Bulletin 1336 AC Drive.
This
document is to be used as a suggestion only. Users must
ensure
that installations meet applicable codes and are suitable for
the existing conditions.
The Bulletin 1336 User Manual should be used as a reference
to
ensure that proper wire selection,routing,and fusing
guidelines
are followed.
WHAT THIS NOTE
CONTAINS
The electrical machine stop is utilized to rapidly decelerate
the motor and connected load. This mode of stopping requires
that the drive has line power applied at all times and
remains
"logically enabled". The drive will not be able to control
the
stopping of the motor and load if power is removed or the
logic
is disabled.
The Bulletin 1336 can be configured for different stopping
modes. The Users will need to determine which mode best suits
the application.
INTENDED
AUDIENCE
This application note is intended to be used by personnel
familiar with the hardware components and programming
procedure necessary to operate the Bulletin 1336/1336VT.
WHERE IT
IS USED
The diagrams, parameter settings, and auxiliary hardware
used in this application note are designed to address
specific issues in many different applications. Some changes
by the Users may be necessary to apply the concepts of this
document to a specific application.
1
ALLEN-BRADLEY
DESCRIPTION
The 1336 drive is configured by digital programming. For a
controlled stop, the choices are DC INJECTION BRAKING or RAMP
TO STOP.
DC INJECTION BRAKING is selected by setting Parameter 10 to a
value of 1. The Users can also select the amount of time the
braking will be applied and the magnitude of the voltage used
for braking with parameters 12 and 13. This mode of braking
will generate up to 40% of rated motor torque for braking and
is typically used for low inertia loads. Refer to table 1 for
parameter settings.
RAMP TO STOP is selected by setting Parameter 10 to a value
of
2. The 1336 will ramp the frequency to zero based on the
deceleration time programmed into parameter 8 and/or 31
(Decel
Time #1 & #2). Parameter 11 (Decel Frequency Hold) must be
set
to zero to allow the drive to follow the programmed
deceleration rate. The "normal" mode of machine operation
can utilize Decel Time #1. If the "Machine Stop" mode
requires
a faster deceleration than Decel Time #1 allows,the "Machine
Stop" can activate Decel Time #2 for a faster rate. Parameter
26 must be set to a value of 1 to access Decel Time #2. Refer
to table 1 for parameter settings.
DYNAMIC BRAKING is utilized to dissipate the regenerated
energy
from the motor during a rapid deceleration. When a STOP
command
is initiated and a short decel time is programmed, the motor
operating mode changes from motoring to generating. The
"speed"
of the rotor will be greater than the "speed" of the stator.
This will cause energy to flow from the rotor to the
stator,and
back into the drive in the form of dc-bus voltage. To prevent
an over voltage on the dc-bus capacitor bank, the dynamic
brake
will "turn on" and dissipate the excess voltage across a
resistor bank. This mode of braking will generate 100% motor
torque for a 20% duty cycle,and allows the fastest decel
time.
To determine if a Dynamic Brake is required, the User must
refer to the Bulletin 1336 Dynamic Brake Manual for specific
details and calculations for correct brake selection. Refer
to
figure 1 for diagram.
APPLICATION
CONSIDERATIONS
DC INJECTION BRAKING - This mode of stopping can cause
excessive motor heating when used in cyclical applications or
with overhauling loads that require high brake voltage
levels.
It is recommended to use the ramp-to-stop for applications
with
these characteristics.
DYNAMIC BRAKING - The rating of the dynamic brake cannot
exceed
the rating of the drive.
PARAMETER SETTINGS
TABLE 1
7
8
ACCEL TIME 1
DECEL TIME 1
10
STOP SELECT
0-600 SECONDS
0-600 SECONDS
0=COAST TO STOP
1=DC INJECTION
2
ALLEN-BRADLEY
12
13
26
DC HOLD TIME
DC HOLD VOLTS
PRESET/2ND ACCEL
30
31
ACCEL TIME 2
DECEL TIME 2
2=RAMP TO STOP
0-15 SECONDS
0-115 VOLTS
0=PRESET SPEEDS
1=2ND ACCEL/DECEL
0-600 SECONDS
0-600 SECONDS
3
ALLEN-BRADLEY
BULLETIN 1336 WITH DYNAMIC BRAKING
460V AC 48-62HZ
L1 L2 L3
115V AC
+DC -DC
TB1
TB2
1
POT HIGH
2
POT WIPER
BULLETIN
TB1
1
2
3
4
1336
DYNAMIC
BRAKE
TB1
1
2
3
4
1336
DYNAMIC
BRAKE
TB1
1
2
3
4
1336
DYNAMIC
BRAKE
MASTER
TB1
5
6
1336
3
POT/SIGNAL COMMON
4
0-10V INPUT
6
4-20MA INPUT
7
PULSE INPUT (-)
8
PULSE INPUT (+)
9
5V METER OUTPUT
10
AT SPEED
11
AT SPEED/RUN COMMON
12
RUN
13
FAULT
14
FAULT/NOT FAULT COMMON
15
NOT FAULT
16
ALARM
17
ALARM/NOT ALARM COMMON
18
NOT ALARM
TB3
START
STOP
5
M-STOP
CUSTOMER
INTERLOCK
CUSTOMER
INTERLOCK
SLAVE
SLAVE
TB1
5
6
TB1
5
6
MOD-L3
115VAC INTERFACE
19
START
20
STOP
21
COMMON
22
JOG
23
REVERSE
24
SW1
25
COMMON
26
SW2
27
SPEED SELECT
28
AUX
29
COMMON
30
ENABLE
TB1
M1 M2
M3 GND
MOTOR
FIGURE #1
4